Fair Value Measurements - Schedule of Information on Assets Measured and Recorded at Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Loans held for investment, at fair value	$ 2,956	$ 2,960
Total recurring fair value measurements	501,292	242,762
Real estate owned, net	15,648	13,068
Individually evaluated/Impaired loans requiring specific allowance, net		125,998
Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total recurring fair value measurements	501,292	242,762
Recurring Fair Value Measurements
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Loans held for investment, at fair value	2,956	2,960
Interest-only strips	845	894
Total recurring fair value measurements	3,801	3,854
Recurring Fair Value Measurements | Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Loans held for investment, at fair value	2,956	2,960
Interest-only strips	845	894
Total recurring fair value measurements	3,801	3,854
Nonrecurring Fair Value Measurements
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total recurring fair value measurements	497,491	238,908
Loans held for sale, net	212,344	214,467
Real estate owned, net	15,648	13,068
Individually evaluated/Impaired loans requiring specific allowance, net	269,499	11,373
Nonrecurring Fair Value Measurements | Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total recurring fair value measurements	497,491	238,908
Loans held for sale, net	212,344	214,467
Real estate owned, net	15,648	13,068
Individually evaluated/Impaired loans requiring specific allowance, net	$ 269,499	$ 11,373